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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                 2021 November 25   
      
                               At the Shadow's Edge   
                   Image Credit & Copyright: Jean-Francois Gout   
      
      Explanation: Shaped like a cone tapering into space, the Earth's dark   
      central shadow or umbra has a circular cross-section. It's wider than   
      the Moon at the distance of the Moon's orbit though. But during the   
      lunar eclipse of November 18/19, part of the Moon remained just outside   
      the umbral shadow. The successive pictures in this composite of 5   
      images from that almost total lunar eclipse were taken over a period of   
      about 1.5 hours. The series is aligned to trace part of the   
      cross-section's circular arc, with the central image at maximum   
      eclipse. It shows a bright, thin sliver of the lunar disk still beyond   
      the shadow's curved edge. Of course, even within the shadow the Moon's   
      surface is not completely dark, reflecting the reddish hues of filtered   
      sunlight scattered into the shadow by Earth's atmosphere.   
      
            Notable APOD Submissions: Lunar Eclipse of 2021 November 19   
                        Tomorrow's picture: pixels in space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
                   NASA Web Privacy Policy and Important Notices   
                         A service of: ASD at NASA / GSFC   
                                & Michigan Tech. U.   
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